condition mean min max ZT0-3 24.014 21.7393 26.2887 ZT4-7 9.733675 9.733675 9.733675 ZT8-11 8.565125 8.565125 8.565125 ZT12-15 0 0 0 ZT16-19 11.7258 11.7258 11.7258 ZT20-23 15.36645 15.36645 15.36645